The manipulation of the
quantum states of electronic spins has been proposed as a possible
technology for the realization of the principles of quantum
computing.[1] The spins can be confined in various forms of matter,
but one that seems convenient is within metals of discrete
coordination molecules,[2-4] which can then be processed or localized
conveniently, prepared in any desired amount with complete
reproducibility and have their properties tuned by chemical
synthesis. Here we discuss the synthesis of a family of dissymmetric
dinuclear coordination complexes, [Ln2], (Ln=any lanthanide, Figure,
left)[5] that fulfill many of the requirements necessary to act as
CNOT or SWAP quantum gates.[6] The synthetic method also allows for
the controlled preparation of a large number of heterometallic
analogues, [LnLn’]. This provides the possibility to study any of
the two individual qubits within the complex by having it be
accompanied by a diamagnetic metal at the place of the other qubit
(eg, [LaLn’] or [LnY]) or to explore other implementation schemes
through the preparation and study of different combinations (such as
[CeEr]). The physical properties proving the suitability of these
chemical systems to embody 2-qubit quantum gates will be discussed
(Figure right).